if(document.getElementById('relative'))document.getElementById('relative').innerHTML='<div>前一篇：<a href=\"/other/chem_knowledge/show.asp?id=188929\" target=\"_self\">FOB、CFR和CIF三种术语的换算</a></div>\n<div>后一篇：<a href=\"/other/chem_knowledge/show.asp?id=193994\" target=\"_self\">危险品等级编码表</a></div>\n';